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Theorem falimfal 1472
Description: A  -> identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
falimfal  |-  ( ( F.  -> F.  )  <-> T.  )

Proof of Theorem falimfal
StepHypRef Expression
1 id 23 . 2  |-  ( F. 
-> F.  )
21bitru 1449 1  |-  ( ( F.  -> F.  )  <-> T.  )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 187   T. wtru 1438   F. wfal 1442
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 188  df-tru 1440
This theorem is referenced by: (None)
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